Choose Grow Lights with Right Light Wavelengths for Your Plants

16 May

Light is very important for plant growth, but plants do not absorb all types of light that the sun emit. Then which types of light will plants absorb during the process of photosynthesis? To discover the answer, it is best to find out what a light wavelength is and why a plant needs light to begin with. We have to go back to school and learn some biology knowledge.

A light wavelength is the distance between the two nearest peaks (the top of the wave) or the two nearest troughs (the bottom of the wave). A lights wavelengths measurement can tell you what the color of the light is. Visible light is measured between 400-700 nm or 400-700 nanometers (a billionth of a meter). The shorter the wavelengths of visible light are more violet in color, the longer the wavelength of visible light are redder in color. Wavelengths shorter than 400 nm are known as ultraviolet (UV) waves whereas wavelengths longer than 700 nm are known as infrared (IR) waves. Most of the light wavelengths plants use for photosynthesis is between 400-750 nm because UV waves and IR waves can actually damage plant life. The primary colors used are blue and red whereas green wavelengths are reflected (giving plants their green color.)

Plant growth depends on photosynthesis and photosynthesis is the process which converts light, water and carbon dioxide into sugar, algae and bacteria. These sugars are used to make adenosine triphosphate (ATP) which is the fuel for all living things. In the outside world, the sun does the work of supplying plants with the light they need. However, for the indoor gardens and greenhouses, which will provide adequate light for photosynthesis? LED grow lights can be the perfect solution.

The very first LED grow lights are designed with six different light wavelengths, primarily blues and reds. This light was designed using only colors that plants need and use for photosynthesis. Traditional white lights emit only 18% of usable light for plants and most of the LED grow lights on the market only emit blue and/or red wavelengths. The newest model, the 300w LED grow light is the most spectrally rich, highest performing plant light source in the world. By designing the LED grow light using only the wavelengths that plants need and keying in on the specific light wavelengths (blues & reds) that they use most for photosynthesis, we now have an indoor grow light that will not only grow plants but will also help in production and blooming.

The LED grow lights are also designed to be environmentally friendly – no lead, no mercury, no glass, no white light pollution, low heat output, made of recyclable aluminum, and is safe around kids and pets.

Only when you have a better understanding of what light is for plants, can you have a better understanding of why the color wavelengths of your grow light are so important. Next time when you are choosing grow lights, you should first understand which types of light it emits and which types of light are useful for you plants. LED grow lights can be the very right choice for your plants since most of light they emit is the useful for photosynthesis.


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  1. Μελέτη φωτισμού

    May 22, 2012 at 8:55 am

    LED lamps have really only recently become bright enough to work as general lighting.
    Also,they still remain more expensive from old lamps.

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    March 4, 2013 at 12:18 am

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